Geological formation in the Río de Las Chinas Valley, Magallanes Basin, Chile
The Dorotea Formation is a geological formation in the Río de Las Chinas Valley of the Magallanes Basin in Patagonian Chile whose strata date back to the Campanian to Maastrichtian of the Late Cretaceous .[ 1]
The Dorotea Formation was first described by Katz in 1963. The formation comprises sandstones with frequent conglomerate lenses, concretionary levels and claystones . The Dorotea Formation includes calcareous sandstones with abundant marine invertebrate and fragmentary vertebrate fossils. Hervé et al. (2004) obtained a maximum radiometric age of 67.4 ± 1.5 Ma from detrital zircons contained in sandstones of the Dorotea Formation.[ 2]
The mudstones and sandstones of the formation were deposited in a fluvial environment . The formation conformably overlies the Tres Pasos Formation and is unconformably overlain by the Lutetian to Bartonian Man Aike Formation .[ 3] Sierra Baguales in the north to 350 metres (1,150 ft) in the eponymous Sierra Dorotea in the south.[ 4]
The following fossils were reported from the formation:[ 5]
Amphibians of Dorotea Formation Taxa Species Material Notes Images Anura [ 6] Indeterminate A frog
^ Dorotea Formation at Fossilworks .org^ a b c d Otero et al., 2009 ^ Goin et al., 2020, p.9 ^ a b c d Otero et al., 2015, p.240 ^ Río de las Chinas Valley at Fossilworks .org^ a b c d e f g Alarcón Muñoz et al., 2020 ^ a b Otero et al., 2015 ^ Alarcón-Muñoz, Jhonatan; Vargas, Alexander O.; Püschel, Hans P.; Soto-Acuña, Sergio; Manríquez, Leslie; Leppe, Marcelo; Kaluza, Jonatan; Milla, Verónica; Gutstein, Carolina S.; Palma-Liberona, José; Stinnesbeck, Wolfgang; Frey, Eberhard; Pino, Juan Pablo; Bajor, Dániel; Núñez, Elaine (2023-06-16). "Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile" . Science Advances . 9 (24): eadg2456. Bibcode :2023SciA....9G2456A . doi :10.1126/sciadv.adg2456 . ISSN 2375-2548 . PMC 10275600 PMID 37327335 . ^ a b c d e Davis, Sarah N.; Soto-Acuña, Sergio; Fernández, Roy A.; Amudeo, Jared; Leppe, Marcelo A.; Rubilar-Rogers, David; Vargas, Alexander O.; Clarke, Julia A. (December 2022). "New records of Theropoda from a Late Cretaceous (Campanian-Maastrichtian) locality in the Magallanes-Austral Basin, Patagonia, and insights into end Cretaceous theropod diversity" . Journal of South American Earth Sciences . 122 : 104163. doi :10.1016/j.jsames.2022.104163 S2CID 254850180 . ^ a b Goin et al., 2020 ^ Martinelli, A. G.; Soto-Acuña, S.; Goin, F. J.; Kaluza, J.; Bostelmann, J. E.; Fonseca, P. H. M. F.; Reguero, M. A.; Leppe, M.; Vargas, A. O. (2021). "New cladotherian mammal from southern Chile and the evolution of mesungulatid meridiolestidans at the dusk of the Mesozoic era" . Scientific Reports . 11 (7594): 7594. Bibcode :2021NatSR..11.7594M . doi :10.1038/s41598-021-87245-4 PMC 8027844 PMID 33828193 . ^ Kuschel, 1959 Alarcón Muñoz, J., S. Soto-Acuña, L. M. E. Manríquez, R. A. Fernández, D. Bajor, J. P. Guevara, F. Suazo Lara, M. A. and A. O. Vargas (2020), "Freshwater turtles (Testudines: Pleurodira) in the Upper Cretaceous of Chilean Patagonia" , Journal of South American Earth Sciences 102 , Bibcode :2020JSAES.10202652A , doi :10.1016/j.jsames.2020.102652 , retrieved 2020-06-12 {{citation }}: CS1 maint: multiple names: authors list (link )Goin, Francisco J.; et, al (2020), "First Mesozoic Mammal from Chile: the southernmost record of a Late Cretaceous Gondwanatherian" (PDF) , Boletín del Museo Nacional de Historia Natural, Chile , 69 (1): 5– 31, doi :10.54830/bmnhn.v69.n1.2020.8 , retrieved 2020-06-12 Otero, R.A.; Soto Acuña, S.; Salazar, C.; Oyarzún, J.L. (2015), "New elasmosaurids (Sauropterygia, Plesiosauria) from the Late Cretaceous of the Magallanes Basin, Chilean Patagonia: Evidence of a faunal turnover during the Maastrichtian along the Weddellian Biogeographic Province" , Andean Geology 42 : 237– 267, doi :10.5027/andgeoV42n2-a05 , retrieved 2020-06-12 Otero, R.A.; Suarez, M.E.; Roux, J.P. (2009), "First record of elasmosaurid plesiosaurs (Sauropterygia: Plesiosauria) in upper levels of the Dorotea Formation, Late Cretaceous (Maastrichtian), Puerto Natales, Chilean Patagonia" , Andean Geology 36 : 342– 350, retrieved 2020-06-12 Kuschel, G (1959), "Un curculionido del Cretácico Superior - primer insecto fósil de Chile", Investigaciones Zoológicas Chilenas 5 : 49– 54 
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